And the sons of Aaron, the priests, shall blow with the trumpets; and they shall be to you for an ordinance for ever throughout your generations.
The sons of Aaron ... Neither the Levites nor any in the common ranks of the people could be employed in this office of signal-giving. In order to attract greater attention and more faithful observance, it was reserved to the priests alone, as the Lord's ministers; and as anciently in Persia and other Eastern countries, the alarm trumpets were sounded from the tent of the sovereign, so were they blown from the tabernacle, the visible residence of Israel's King (see the notes at the phrase "ordinance forever," Exodus 12:14; Exodus 12:17; Exodus 12:24; Leviticus 16:34).